| Distribution network is the main link to generate power loss.With the increasing power load,the permeability of distributed generation increases,the structure of distribution network becomes increasingly complex,and the calculation of distribution network loss faces new challenge.Energy loss calculation and loss reduction analysis have become an important way for distribution network to operate economically and efficiently.In this paper,the causes of distribution network loss are analyzed in depth from the aspects of distribution transformer,capacitor reactor and distribution line.The traditional algorithms of power loss in medium-voltage distribution network are summarized,and the applicable scenarios of various methods are compared and analyzed.With the increase of the permeability of voltage source converter type distributed generation in distribution network,this kind of distributed generation often has current limiting characteristics.An improved superposition current method considering the current limiting characteristics of voltage source converter typ e distributed generation is proposed in this paper.Based on the superposition theory,the branch current calculation model under the independent action of source and load in distribution network is obtained,and the loss increment model of active power and reactive power considering the current limiting characteristics of voltage source converter type distributed generation is further derived.From the aspects of design principle,overall structure,software and hardware design,system development platform and operation environment,the theoretical loss calculation system of medium voltage distribution network is studied,and the design scheme of loss calculation software is expounded.The software can accurately calculate the power loss of distribution network,find out the main contributing units of network loss,and provide a reference scheme for the technical loss reduction of distribution network. |
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